[Feature Request] Fullscreen TUI: separate mouse-wheel scroll from click capture to enable native text selection

Bug Description
Title: Fullscreen TUI: forced choice between mouse-click capture and losing wheel scroll

Summary: Since fullscreen TUI mode (tui: "fullscreen") became active, mouse interaction is frustrating with no good middle ground.

Problem:

• With fullscreen on, dragging to select text registers as a click and triggers menu/option selection, so I can't select text to copy.
• CLAUDE_CODE_DISABLE_MOUSE=1 fixes selection but disables mouse-wheel scrolling, which is also bad.
• CLAUDE_CODE_DISABLE_MOUSE_CLICKS=1 keeps the wheel but native drag-select still requires Shift+drag.

There's no single setting that gives both: normal drag-to-select-and-copy AND mouse-wheel scrolling. I ended up reverting to tui: "default" to get the old behavior back.

Request: In fullscreen mode, let plain drag select/copy text (as the classic terminal does) while keeping wheel scroll — i.e. don't capture left-button drag for UI interaction, or add a setting that does this.

Environment: Claude Code 2.1.196, macOS (Darwin 25.4.0), zsh.

Environment Info

• Platform: darwin
• Terminal: vscode
• Version: 2.1.196
• Feedback ID: c480b8eb-cbe9-466c-8e82-d3c6ac20c45e

Errors

[]